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Finding the Fourth Proportional to 840.63, 1,258.25 and 449.66

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Solution

The fourth proportional to 840.63, 1,258.25 and 449.66 is: 673.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    840.63 : 1,258.25 = 449.66 : x
  2. Step 2: Convert to fraction form
    840.63/1,258.25 = 449.66/x
  3. Step 3: Cross multiply
    840.63x = 1,258.25 × 449.66
  4. Step 4: Simplify right side
    840.63x = 565,776.16
  5. Step 5: Solve for x
    x = 565,776.16/840.63
  6. Step 6: Final answer
    x = 673.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.